Are you sure your opinions are your own? If you based your opinions on experts on TV, you may have an issue. There’s a small group of propaganda experts that have shaped the world’s view of tobacco, toxins, and global warming.

“Merchants of Doubt” is a documentary film, based on a book by the same name, that looks into the professionals whose jobs it is to cast doubt on scientists to appease corporations.

Made by the creator of “Food, Inc.”, “Merchants of Doubt” will be shown at the Durango Public Library, 1900 East Third Ave., on Thursday, April 27.